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Physics - Magnetism Question with Solution | TestHub

PhysicsMagnetismMagnetic Dipole & MomentMedium2 minPYQ_2018

PhysicsMediumsingle choice

Assertion : When radius of a circular loop carrying current is doubled, its magnetic moment becomes four times. Reason : Magnetic moment depends on area of the loop.

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Answer:

Solution:

Magnetic dipole moment of the current loop $=$ Ampere turns $\times$ Area of the coil or $M = N I π r^{2}$ When radius of the coil becomes double, new magnetic moment will be $M_{1} = N I π (2 r)^{2} = 4 N I π r^{2} = 4 M$ Hence magnetic moment becomes four times when radius is doubled.

Stream:AIIMSSubject:PhysicsTopic:MagnetismSubtopic:Magnetic Dipole & Moment

⏱ 2mℹ️ Source: PYQ_2018

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